<template>
	<view>
		<view class="scroll-view-container">

			<!-- 左侧滚动控件 ':'这个符合让变量参数变成动态加载 -->
			<scroll-view class="left-scroll-view" scroll-y="true" :style="{height:wh + 'px'}">
				<block v-for="(item,i) in cateList" :key="i">
					<view :class="['left-scroll-view-item',i == active ? 'active' : '']" @click="activeChanged(i)">
						{{item.cat_name}}
					</view>
				</block>
			</scroll-view>

			<!-- 右侧滚动控件 -->
			<scroll-view class="right-scroll-view" scroll-y="true" :style="{height:wh + 'px'}" :scroll-top="scrollTop">
				<!-- 二级菜单 -->
				<view class="cate-lv2" v-for="(item2,i2) in cateLevel2" :key="i2">
					<!-- 二级菜单标题 -->
					<view class="cate-lv2-title">/ {{item2.cat_name}} /</view>

					<!-- 三级菜单 -->
					<view class="cate-lv3-list">
						<view class="cate-lv3-item" v-for="(item3,i3) in item2.children" :key="i3" @click="gotoGoodsList(item3)">
							<!-- 图片 -->
							<image :src="item3.cat_icon.replace('ugo-dev','hmugo-web')" mode="widthFix" />
							<!-- 文本 -->
							<text>{{item3.cat_name}}</text>
						</view>
					</view>

				</view>
			</scroll-view>

		</view>
	</view>
</template>

<script>
	export default {
		data() {
			return {
				//有效高度
				wh: 0,
				//分类数据
				cateList: [],
				active: 0,
				//二级分类
				cateLevel2: [],
				scrollTop: 0,
			};
		},

		onLoad() {
			this.getWindowData()
			this.getCateList()
		},

		methods: {
			//获取窗口数据
			getWindowData() {
				const res = uni.getWindowInfo()
				this.wh = res.windowHeight
			},

			//获取分类数据列表
			async getCateList() {
				const {
					data: res
				} = await uni.$http.get('/api/public/v1/categories')
				console.log(res)
				if (res.meta.status !== 200) return uni.$showMsg()
				this.cateList = res.message
				//为二级分类赋值
				this.cateLevel2 = res.message[0].children
				console.log(this.cateLevel2)
			},

			//修改active值
			activeChanged(e) {
				this.active = e

				this.cateLevel2 = this.cateList[e].children
				console.log(this.cateLevel2)

				this.scrollTop = this.scrollTop === 0 ? 1 : 0
			},

			//跳转至商品清单
			gotoGoodsList(e) {
				uni.navigateTo({
					url: '/subpkg/goods_list/goods_list?cid=' + e.cat_id
				})
			}
		}
	}
</script>

<style lang="scss">
	.scroll-view-container {
		display: flex;

		.left-scroll-view {
			width: 120px;

			.left-scroll-view-item {
				background-color: #f7f7f7;
				line-height: 60px;
				text-align: center;
				font-size: 12px;

				&.active {
					background-color: #ffffff;
					position: relative;

					&::before {
						content: ' ';
						display: block;
						width: 3px;
						height: 30px;
						background-color: #c00000;
						position: absolute;
						top: 50%;
						left: 0;
						transform: translateY(-50%);
					}
				}
			}
		}

		.right-scroll-view {

			.cate-lv2-title {
				font-size: 12px;
				font-weight: bold;
				text-align: center;
				padding: 15px;
			}

			.cate-lv3-list {
				display: flex;
				flex-wrap: wrap;

				.cate-lv3-item {
					width: 33.33%;
					display: flex;
					flex-direction: column;
					justify-content: center;
					align-items: center;
					margin-bottom: 10px;

					image {
						width: 60px;
						height: 60px;
					}

					text {
						font-size: 12px;
					}
				}
			}

		}

	}
</style>